compat/win32/pthread.h

   1 /*
   2  * Header used to adapt pthread-based POSIX code to Windows API threads.
   3  *
   4  * Copyright (C) 2009 Andrzej K. Haczewski <ahaczewski@gmail.com>
   5  */
   6
   7 #ifndef PTHREAD_H
   8 #define PTHREAD_H
   9
  10 #ifndef WIN32_LEAN_AND_MEAN
  11 #define WIN32_LEAN_AND_MEAN
  12 #endif
  13
  14 #include <windows.h>
  15
  16 /*
  17  * Defines that adapt Windows API threads to pthreads API
  18  */
  19 #define pthread_mutex_t CRITICAL_SECTION
  20
  21 #define pthread_mutex_init(a,b) InitializeCriticalSection((a))
  22 #define pthread_mutex_destroy(a) DeleteCriticalSection((a))
  23 #define pthread_mutex_lock EnterCriticalSection
  24 #define pthread_mutex_unlock LeaveCriticalSection
  25
  26 /*
  27  * Implement simple condition variable for Windows threads, based on ACE
  28  * implementation.
  29  *
  30  * See original implementation: http://bit.ly/1vkDjo
  31  * ACE homepage: http://www.cse.wustl.edu/~schmidt/ACE.html
  32  * See also: http://www.cse.wustl.edu/~schmidt/win32-cv-1.html
  33  */
  34 typedef struct {
  35         LONG waiters;
  36         int was_broadcast;
  37         CRITICAL_SECTION waiters_lock;
  38         HANDLE sema;
  39         HANDLE continue_broadcast;
  40 } pthread_cond_t;
  41
  42 extern int pthread_cond_init(pthread_cond_t *cond, const void *unused);
  43 extern int pthread_cond_destroy(pthread_cond_t *cond);
  44 extern int pthread_cond_wait(pthread_cond_t *cond, CRITICAL_SECTION *mutex);
  45 extern int pthread_cond_signal(pthread_cond_t *cond);
  46 extern int pthread_cond_broadcast(pthread_cond_t *cond);
  47
  48 /*
  49  * Simple thread creation implementation using pthread API
  50  */
  51 typedef struct {
  52         HANDLE handle;
  53         void *(*start_routine)(void*);
  54         void *arg;
  55         DWORD tid;
  56 } pthread_t;
  57
  58 extern int pthread_create(pthread_t *thread, const void *unused,
  59                           void *(*start_routine)(void*), void *arg);
  60
  61 /*
  62  * To avoid the need of copying a struct, we use small macro wrapper to pass
  63  * pointer to win32_pthread_join instead.
  64  */
  65 #define pthread_join(a, b) win32_pthread_join(&(a), (b))
  66
  67 extern int win32_pthread_join(pthread_t *thread, void **value_ptr);
  68
  69 #define pthread_equal(t1, t2) ((t1).tid == (t2).tid)
  70 extern pthread_t pthread_self(void);
  71
  72 static inline int pthread_exit(void *ret)
  73 {
  74         ExitThread((DWORD)ret);
  75 }
  76
  77 typedef DWORD pthread_key_t;
  78 static inline int pthread_key_create(pthread_key_t *keyp, void (*destructor)(void *value))
  79 {
  80         return (*keyp = TlsAlloc()) == TLS_OUT_OF_INDEXES ? EAGAIN : 0;
  81 }
  82
  83 static inline int pthread_setspecific(pthread_key_t key, const void *value)
  84 {
  85         return TlsSetValue(key, (void *)value) ? 0 : EINVAL;
  86 }
  87
  88 static inline void *pthread_getspecific(pthread_key_t key)
  89 {
  90         return TlsGetValue(key);
  91 }
  92
  93 #endif /* PTHREAD_H */